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EWG's Tap Water Database — 2021 UPDATE

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2,3,7,8-TCDD (Dioxin)

California American Water Company - Parkway

Dioxins are contaminants released from chemical manufacturing, pulp and paper bleaching, and incineration of products that contain chlorine. 2,3,7,8-Tetrachlorodibenzodioxin (2,3,7,8-TCDD) is the most toxic chemical in the group of dioxins. Read More.

Dioxins are among the most toxic known environmental pollutants. As a class, dioxins are extremely toxic, persistent and bioaccumulative; these contaminants build up and are stored in fatty tissues and fluids, such as breast milk, and pass from the mother to the child. Most people are exposed to dioxins through the food they eat, primarily from meat, dairy, fish and eggs. In humans, dioxins are associated with cancer, birth defects, damage to the nervous and immune systems, altered metabolism, thyroid disruption, altered menstrual cycling and damage to the cardiovascular system.

 

43

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015N/A00N/A
2016ND70ND
2017ND10ND
2018ND350ND
2019N/A00N/A

ppt = parts per trillion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.0002 ppt

The EWG Health Guideline of 0.0002 ppt for 2,3,7,8-TCDD was defined by the Environmental Protection Agency as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

EPA Maximum Contaminant
Level (MCL) 0.03 ppt

ppt = parts per trillion

All test results

Date Lab ID Result
2016-09-209590-002-1140ND
2016-09-209590-003-1120ND
2016-09-209590-011-1215ND
2016-09-209590-008-1022ND
2016-12-199590-002-0935ND
2016-12-219590-006-1300ND
2016-12-229590-011-1000ND
2017-10-111228-013-1440ND
2018-01-109590-012-1055ND
2018-01-239590-014-1003ND
2018-03-129590-012-1212ND
2018-05-019590-023-0955ND
2018-05-019590-003-1115ND
2018-05-019590-008-1155ND
2018-05-019590-022-0955ND
2018-05-019590-021-0900ND
2018-05-019590-015-0845ND
2018-05-029590-017-1155ND
2018-05-029590-006-0837ND
2018-05-029590-011-1205ND
2018-05-022116-002-1140ND
2018-05-039590-013-0850ND
2018-05-039590-018-1000ND
2018-05-039590-026-1040ND
2018-05-039590-014-1120ND
2018-05-039590-024-1015ND
2018-06-139590-025-0809ND
2018-08-089590-002-1100ND
2018-08-099590-016-0930ND
2018-08-099590-017-0835ND
2018-08-099590-006-1140ND
2018-08-149590-015-1020ND
2018-08-149590-021-1005ND
2018-08-149590-013-1145ND
2018-08-149590-022-0910ND
2018-08-149590-011-0900ND
2018-08-149590-023-0830ND
2018-08-142116-025-0740ND
2018-08-149590-008-1050ND
2018-08-159590-026-1255ND
2018-08-159590-024-1250ND
2018-08-159590-018-1210ND
2018-10-089590-016-0935ND